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Methylcyclopentanone Condensed with Methyl Vinyl Ketone to Give the Dione

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Methylcyclopentanone Condensed with Methyl Vinyl Ketone to Give the Dione In presenting the dissertation as a partial fulfillment of the requirements for an advanced degree from the Georgia Institute of Technology, I agree that the Library of the Institute shall make it available for inspection and circulation in accordance with its regulations governing materials of this type. I agree that permission to copy from, or to publish from, this dissertation may be granted by the professor under whose direction it was written, or, in his absence, by the Dean of the Graduate Division when such copying or publication is solely for scholarly purposes and does not involve potential f inane ia]. gain. It is under­ stood that any copying from, or publication of, this dis­ sertation which involves potential financial gain will not be allowed without written permission. 3/17/65 PART I REACTIONS OF ENOLATES DERIVED FROM UNSYMMETRICAL CYCLIC KETONES PART n PHOTOCHEMICAL REARRANGEMENTS OF CROSS CONJUGATED CYCLOHEXADIENONES RELATED TO INDAN A THESIS Presented to The Faculty of the Graduate Division by William Joseph Powers, III In Partial Fulfillment of the Requirements for the Degree Doctor of Philosophy in the School of Chemistry Georgia Institute of Technology May, 1968 PART I REACTIONS OF ENOLATES DERIVED FROM UNSYMMETRICAL CYCLIC KETONES PART II PHOTOCHEMICAL REARRANGEMENTS OF CROSS CONJUGATED CYCLOHEXADIENONES RELATED TO INDAN Approved: Chairman —T, approved by Cha&limn: "JY\ 0*^ 7y 1 ii ACKNOWLEDGMENTS The author is grateful to Professor Drury S. Caine, III for suggesting these problems and for his patience and guidance throughout the course of this research. The author also wishes to thank Professors John R. Dyer and Charles L. Liotta for serving as members of his reading committee. Many thanks are also due to several of the author's fellow students who provided technical assistance and many helpful discussions: George M. Atkins, Jr. , Byron J. L. Huff, Dr. John F. DeBardeleben, Jr. , and especially J. Byron Dawson, whose aid proved invaluable on numerous occasions. The technical assistance of Mr. George Turner in obtaining mass spectral data, Professor Richard H. Cox (Athens, Georgia) for 100 megacycle nuclear mag­ netic resonance spectra, and Mr. Anibal A. Boucugnani for assistance with some of the experimental work in Part II is gratefully acknowledged. The support of this research by the Petroleum Research Fund, administered by the American Chemical Society (Part I) and the National Aeronautics and Space Administration (Part II) is appreciated. Finally, the author is grateful to his parents for their support and encourage­ ment during the entire period of study. The author also wishes especially to thank his wife for her patience, encouragement, and understanding and for typing the rough and first drafts of this dissertation. iii LIST OF TABLES PART n Table Page 1. Spectral Properties of Simple 6/5-Fused Cross-Conjugated Cyclohexadienones 97 2. Spectral Properties of Some Heteroannular Dienones 104 3. Ultraviolet Spectra of Some Homoannular Dienones 107 4. Spectra of Rearranged Hydroxyketones 110 LIST OF CHARTS PART I CHART Page 1. General Scheme for Direct Base Catalyzed Alkylation of a Ketone 2 2. Enolate Compositions of 2-Methylcyclohexanone in DME ... 42 3. Enolization of Some 2-Alkylcyclohexanones 44 4. Kinetic Lithium Enolates of 2-Methylcyclopentanone in THF and DME 47 5. Alkylation of Some Lithium Enolates with Methyl Iodide .... 48 iv LIST OF CHARTS (Concluded) PART n Chart Page 1. Mechanism of the Photochemical Rearrangement of Cross-Conjugated Cyclohexadienones 59 2. Acid Catalyzed Reactions of Lumiproducts 62 3. Anomalous Photochemical Reactions of Lumiproducts 64 4. Syntheses of Some Dihydroindanones 94 5. Irradiation of 7a-Methyl-5(7aH)-indanones in Dioxane 101 6. Spectral Properties of Some Lumiproducts 102 V GLOSSARY OF ABBREVIATIONS DME 1,2-dimethoxyethane DDHQ 2, 3-dicyano-5, 6-dichlorohydroquinone DDQ 2, 3-dicyano- 5, 6-dichlorobenzoquinone Dow 550 silicone oil (Dow Chemical Company) Hz Hertz SE-30 silicone gum rubber (methyl) TMS tetramethylsilane, nmr standard THF tetrahydrofuran vpc vapor phase chromatography TABLE OF CONTENTS Page ACKNOWLEDGMENTS ii LIST OF TABLES iii LIST OF CHARTS iii GLOSSARY OF ABBREVIATIONS v PART I Chapter I. INTRODUCTION 2 n. INSTRUMENTATION AND EQUIPMENT 11 III. EXPERIMENTAL 12 2-Ethylcyclohexanone (III) 12 o-Isopropylanisole (IV) 13 2-Isopropylcyclohexanone (V) 13 2, 4,4-Trimethylcyclohex-2-en-l-one (VI) 15 2, 4,4-Trimethylcyclohexanone (VTI) 15 2, 2,4,4-Tetramethylcyclohexanone (VHI) 16 2-Methylcyclopentanone (IX). 17 2,5-Dimethylcyclopentanone (X) 18 Phenyllithium 18 vii TABLE OF CONTENTS (Continued) Chapter Page Kinetic Potassium Enolates of 2-Ethyl- cyclohexanone (III) 23 Equilibrium Potassium Enolates of 2-Ethyl - cyclohexanone (III) 23 Alkylation of the Kinetic Lithium Enolates of 2-Ethylcyclohexanone (III) with Methyl Iodide 24 Kinetic Lithium Enolate of 2-Isopropylcyclo- hexanone (V) 25 Equilibrium Lithium Enolates of 2-Isopropyl- cyclohexanone (V) 26 Kinetic Potassium Enolates of 2-Isopropyl- cyelohexanone (V) 27 Equilibrium Potassium Enolates of 2-Isopropyl- cyclohexanone (V) 28 Alkylation of the Kinetic Lithium Enolate of 2-Isopropylcyclohexanone (V) 29 Equilibrations of Enol Acetate Mixtures 30 Apparent Kinetic Lithium Enolates of 2,4,4- Trimethylcyclohexanone (VII) 31 Equilibrium Lithium Enolates of 2,4,4-Tri- methylcyclohexanone (VII) 32 Kinetic Potassium Enolates of 2,4,4-Tri- methylcyclohexanone (VII) 33 Alkylation of the Kinetic Lithium Enolates of 2,4,4-Trimethylcyclohexanone (VII) with Methyl Iodide 34 viii TABLE OF CONTENTS (Continued) Chapter Page Alkylation of the Equilibrium Lithium Enolates of 2,4,4-Trimethylcyclohexanone (VTI) with Methyl Iodide .... 35 Kinetic Lithium Enolates of 2-Methylcyclopentanone (IX) ... 35 Alkylation of the Kinetic Lithium Enolates of 2-Methyl­ cyclopentanone with Methyl Iodide 36 IV. DISCUSSION OF RESULTS 38 V. CONCLUSIONS 50 VI. RECOMMENDATIONS 51 LITERATURE CITED 52 PART II Chapter Page I. INTRODUCTION 56 H. INSTRUMENTATION AND EQUIPMENT 70 IH. EXPERIMENTAL 72 2-Methylcyclopentanone (XXII) 72 7, 7a-Dihydro-7a-methyl-5(6H)-indanone (XXIII) 72 Methyl isopropenyl ketone 73 6, 7a-Dimethyl-7,7a-dihydro-5(6H)-indanone (XXVI) 74 4,7a-Dimethyl-7,7a-dihydro-5(6H)-indanone (XXVII) 76 7a-Methyl-5(7aH)-indanone (XXVIII) 77 ix TABLE OF CONTENTS (Continued) Chapter Page 6,7a-Dimethyl-5(7aH)-indanone (XXLX) 78 4,7a-Dimethyl-5(7aH)-indanone (XXX) 79 Dehydrogenation of XXIII with DDQ 80 Dehydrogenation of XXVI with DDQ 81 Irradiation of 7a-Methyl-5(7aH)-indanone (XXVTII) in Anhydrous Dioxane at 2537 A 81 Attempted Reaction of 7a-Methyl-3a, 7a-dihy- dro-3a, 7a-cyclo-6(7H)-indanone (XXXIII) with Silica Gel 83 Attempted Thermal Rearrangement of 7a-Methyl- 3a, 7a-dihydro-3a, 7-cyclo-6-(7H)-indanone (XXXIII) 83 Irradiation of 7a-Methyl-3a, 7a-dihydro-3a, 7- cyclo-6(7H)-indanone in Anhydrous Dioxane: Broad Spectrum Lamp 83 Irradiation of 7a-Methyl-5(7aH)-indanone (XXVUI) in Anhydrous Dioxane: Broad Spectrum Lamp 84 Irradiation of 6,7a-Dimethyl-5(7aH)-indanone (XXLX) in Anhydrous Dioxane 84 Irradiation of 4,7a-Dimethyl-5(7aH)- indanone (XXX) in Anhydrous Dioxane 85 Irradiation of 4, 7a-Dimethyl-5(7aH)-indanone (XXX) in Anhydrous Dioxane: Broad Spectrum Lamp 86 Catalytic Hydrogenation of 4,4-Dimethyl- tetrahydro-A6'7; 8'9-5-indanone (XXXVII) 86 Irradiation of 4, 7a-Dimethyl-5(7aH)-indanone (XXX) in 45 percent Aqueous Acetic Acid 87 X TABLE OF CONTENTS (Concluded) Chapter Page Irradiation of 1,7a-Dimethyl-3a, 7a-dihydro-3a, 7-cyclo-6(7H)-indanone (XXXVI) in 45 percent Aqueous Acetic Acid 88 Irradiation of 6, 7a-Dimethyl-5(7aH)-indanone (XXIX) in 45 percent Aqueous Acetic Acid 89 Reaction of 5,7a-Dimethyl-3a, 7a-dihydro-3a, 7-cyclo-6(7H)-indanone (XXXV) with Aqueous Acetic Acid 90 Periodic Acid Oxidation of 6,7a-Dimethyl-6- hydroxy-3,4, 6, 7-tetrahydro-3a, 7-cyclo-5(7aH)- indanone (XL) 91 IV. DISCUSSION OF RESULTS 92 V. CONCLUSIONS 115 VI. RECOMMENDATIONS 116 LITERATURE CITED 117 VITA 120 PART I 2 CHAPTER I INTRODUCTION Alkylation of enolates derived from ketones is an often employed method of forming a new carbon-carbon bond. Despite the wide use of this technique in synthetic organic chemistry, the method suffers several disadvantages, particu­ larly when an unsymmetrical ketone is to be alkylated. One of the biggest draw­ backs of direct base catalyzed alkylation of a ketone is that a complex mixture of mono and polyalkylated products is often formed, requiring difficult and often tedious separation of the desired alkylation product. This difficulty is shown in Chart I, using 2-methylcyclohexanone as a model compound (1). With triphenyl- methylpotassium, initial enolate formation is irreversible (2). Enolization is most likely reversible with most weaker bases, such as potassium tert-butoxide and sodamide. A second problem of direct base catalyzed alkylation which is particularly troublesome in the case of cyclopentanones is that of self condensation of the ke­ tone to form dimers or large oligomers (3). Many ingenious methods of directing alkylation to the desired position have appeared in the literature. These methods can generally be placed in four categories: (1) Use of a blocking group at the unsubstituted alpha position which then forces the alkylating agent to react at the substituted position only. The blocking 0 Chart 1. General Scheme for Direct Base Catalyzed Alkylation of a Ketone 4 group is then removed. (2) Introduction of an electron withdrawing activating group at the unsub- stituted alpha positions. This makes the activated position much more reactive and directs the alkylation to it. The activating group is then removed. (3) The formation and alkylation of enamines and Schiff base anions. (4) Reductive-alkylation methods. Methods 1 and 2 suffer from the serious disadvantage of requiring several steps in order to obtain the desired alkylation product. Method 3 has chiefly been applied to symmetrical ketones. Method 4 has the serious disadvantage that many of the compounds needed for reduction are difficult to synthesize.
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